Insulator-locking device



Nov. 20, 1928.

R. S. DICKEY ET AL INSULATOR LOCKING DEVICE Filed 001;. 15', 1927 INVENTORS.

R. .S PIC/(5) IPA.CARNAHAN BY ATTORNEY i Wooden pin which is threaded at2 and to Patented Nov. 20, 1928.

j sures guy s. 'pIcxEY 48 n PAUL A. CARNAHAN, or MANHATTAN, KANSAS.

INSULATOB-LOCKING DEVICE.

a u ati n filed Qetoher 15, 1927] I Serial no. 226,364.

Q11! invention relates to improvements in i devices for locking insulators, such as those used on electriclight, ower and telephone lines, itconsists in t ecombinations, constructionsandarrangements herein described 2 rd c a An object of our invention to prov de a locking device which is simple in construction but positive in operation and which will prevent loosening of the insulator from itssu port. Y

A urther object is to provide a construction which is so arranged that the insulator is virtually'made self-locking in that when it is screwed on to the pin the locking device is brought into play.

A further object is to provide a locking device which may be employed in connection with the standard pins for insulators in common use with but slight alteration.

Other objects and advantages will appear in the followin specification, and the novel features of the invention will be particularly pointed out in the appended claims.

Our invention is illustrated in the accompanying drawings, forming'part of this application, in which Figure l is a sectional view through an insulator and a portion of the supporting pin, showing the locking means, and

Figure 2 is a section along the line 22 of Fi ure 1.

11 carrying out ourinvention, we make use, as stated, of a standard insulator support such as that shown at 1. This is a tapered which the insulator is designed to be applied. The insulator 3 may be of any suitable shape, such as that shown in the drawings. It is provided with a tapered socket 4 arranged to receive the in 1 and is threaded at 5 to'engage the threads on the pin.

So far, the construction described is ordinary. Our invention contemplates the use of a locking key, such as that shown at 6. This key, it will be observed, has an elongated body portion which is slightly curved or bowed as shown at 6. One end of the pin is bent to form an extension 6 which is substantially at right angles to the general longitudinal axis of the body portion. The opposite end is also bent to form a lateral extension 6.

In using the locking key, the pin 1 is provided with a slot 7 which extends inwardly from the outer face of the pin and from a,

pin. It will be observed that this bore is substantially in'alignment with the lower edge of the insulator.

In nsin the locking device, the key 6 is placed int 1e slot 7 with the extension 6" entering the bore 8. The key is of such dimensions that when the insulator is applied to the pin the portion 6 will engage in the threads of the insulator. Now when the insulator isforced on by turning it, the lower threads of the i.n sulator will engage the outer surface of the pin, tending to rock the in on the convex curve portion 6 so as to Force the extension 6 further into the bore 8 while the extension 6 is forced, frictionally against the threads of the insulator. Eventually, a point will be reached where the insulator can be moved no farther, and, when this point is reached, the extension 6 will be firmly pressed against the bottomof the threads of the insulator, the

body portion of the key will be flexed so as to provide a spring tension on the extension 6" and this spring tension will cause such friction that the backing of the insulator oil without using intentional force is impossible.

It will thus be seen that all that is neces sary after having provided the slot and the bore in the pin is to insert the key and turn tion of wood pins to insulators of different diameters by the use of expanding type steel pins. These are expensive, since they usually require a split ferrule or a coil spring to engage the threads of the insulator. These are expensive and are not entirely practical. Our key, it will be observed, may be used to secure insulators of various diameters, of course within limits. It is only a question of providing a slot such as that shown at 7 and a bore such as that shown at 8 of proper dimensions so as to enable the threads of the insulator to engage a portion of the key on one side to swing it about the opposite convex side of the fulcrum and to force the extension 6 into the thread of the insulator to hold it securely. It is even possible by this key to hold an insulator securely to a the latter is threaded or not.

VVe elaim:

1. The combination with an insulator supporting pin having a slot and a bore communicating therewith, of an insulator having threads, a locking key having an end arranged to enter said bore, the opposite end being arranged to enter one of the threads of the insulator, a portion of said key between the ends serving as a fulcrum, and a portion of the key being arranged to be engaged by the threads of the insulator to rock the key on its fulcrum. v

2. lhe combination with an insulator supporting pin, of an insulator-having threads, a locking key carried by the pin, said looking key having a projecting end arranged to enter the threads of the insulator, a fulcrum portion, and a portion adapted to be pin whether Leeaoea key having one end bent laterally to enter the bore, the opposite end bent laterally to enter one of the threads of the insulator; and the portion between theends being bowed to form a fulcrum, said key being normally disposed in the slot and having a portion arranged to be engaged by the insulator for swinging the key on its fulcrum.

RAY S. DICKEY. PAUL A. CARNAHAN. 

